This unit is mainly to cultivate children's concept of space, but it is not as simple as taking pictures. Be sure to let the children operate and gradually establish the concept of this space in the process of operation.

Knowledge points in mind mapping:

1, when you look at the same object from different angles, the shape of the object you see is generally different.

2. When observing an object, we should grasp the characteristics of the object to judge.

Look at one side of a cuboid, and you may see a rectangle or a square. When you look at one side of a square, all you see is a square.

5. Observe this cylinder, and you will see a rectangle or a circle. When you look at a sphere, all you see is a circle.

The second grade mathematics observation object volume one

It is the first time for students to observe objects in the observation unit of mathematics in the first volume of the second day of junior high school, and they are not familiar with the "relativity" of positional relationship, especially the left-right relativity is a difficult point for students to learn.

In order to prevent the above problems from becoming obstacles for students to observe objects, the concepts of "front, back, left and right" are not introduced in this unit for the time being. As long as students can connect the observers with the figures they see by connecting lines and numbering, it is also allowed for students to use the above concepts spontaneously in the learning process.